I need to make a muffler gasket for my Partner 500, well at least I think I should? I am worried about the possible sucking in some air and harming the P/C. I have made one in the past by stacking 4 pcs of 10 tho shim stock (last week in fact). I am wondering if you could use thick gasket material instead? I think if it was sandwhiched tightly inbetween the muff and jug It would not burn out, (lack of air to combust? ) Anyway if you ever made one tell me what you used metal-beer can? / or fiber of some sort. Jeff